Finite Element Simulation Analysis Andintelligent Temperature Monitoring Of Temperature Of Mass Concrete

Due to its big size of mass concrete,large volume of one-time pouring of the concrete,and complicated engineering conditions,all kinds of cracks in concrete structures are easily produced without effective control on construction measurement,which results in unfavorable impermeability,durability and bearing capacity of concrete construction.Therefore,prior to the construction,the thermal stress simulation analysis must be carried out according to the actual condition of mass concrete and crack prevention measures must be formulated correspondently in order to improve the bearing strength and durability of structure.There are many factors that affect the temperature of concrete.The thermal stress numerical calculation model and accurate selection of parameters are difficult,so the calculation is complicated.At present,the selection of calculation parameters is usually obtained by laboratory experiments or rely on past experience formulas.However,the high cost of test and limitations of the test result in certain difference between the parameters obtained and that of actual project.In order to overcome these shortcomings,back analysis of field measured data is used to obtain temperature calculation model and parameters,which has become one of the effective ways to replace laboratory experiments to obtain model and parameter.Based on the He-Da Highway Er Song Hua jiang bridge project,this paper analyses the forming factors of temperature field and relevant parameters influencing hydration heat temperature field of mass concrete,and finite element software Midas Civil is applied in accordance with the actual size of a s tructure construction and organization design to build finite element analysis model for simulation analysis of thermal stress.According to the simulation results and practical engineering technical characteristics presented in the actual construction,the process of temperature control and cracking prevention technology solutions is proposed.Then,depending on t he temperature control and cracking prevention technology measures to realign the relevant parameters of finite element analysis model to calculate the typical distribution of temperature field and thermal stress field variation,and then to lay temperature sensor,establish smart concrete temperature monitoring system,and monitor the concrete temperature and stress on-site.Last,the numerical values are compared with the measured values and the technology of temperature control and cracking prevention measures is evaluated in theory.At the same time,the data is accumulated for future similar engineering analysis and calculation.Research results show that for this project,the result of simulation analysis and calculation of thermal stress is the same as actual condition.The cracking prevention technology solutions proposed on t he calculation result of simulation analysis is effective and no thermal crack is found in mass concrete construction,which ensure engineering quality and construction schedule.Through the back analysis of collected monitoring data,the experience for concrete thermal calculation and control in future similar engineering is accumulated.